<!--
 * @Author: your name
 * @Date: 2021-08-05 16:26:21
 * @LastEditTime: 2021-08-05 18:32:22
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \briup\3-html&css\day04\2-类名选择器.html
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>类名选择器</title>
    <style>
        .app {
            height: 170px;
            width:60px;
            border:1px solid pink;
            border-radius: 50%;
        }
        .circle {
            height: 50px;
            width:50px;
            border-radius: 50%;
            background-color: turquoise;
            margin:5px;
        }
        .one {
        
            background-color: yellow;
        }
        .two {
            background-color: tomato;
        }
        .three {
            
            background-color: violet;
        }
    </style>
</head>
<body>
    <div class="app">
        <div class="one circle"></div>
        <div class="two circle"></div>
        <div class="three circle"></div>
        
    </div>
</body>
</html>